Catalase is a tetramer of four polypeptide chains, each over 500 amino acids long.It contains four porphyrin heme (iron) groups that allow the enzyme to react with the hydrogen peroxide.The optimum pH for human catalase is approximately 7, and has a fairly broad maximum (the rate of reaction does not change appreciably at pHs between 6.8 and 7.5).atalase is a tetramer of four polypeptide chains, each over 500 amino acids long.
Josh Duhamel. Joshua David Josh Duhamel (/dÉËmÉl/ dÉ-MEL; born November 14, 1972) is an American actor and former fashion model. After various modeling work, he made his acting debut as Leo du Pres on the ABC daytime soap opera All My Children and later starred as Danny McCoy on NBC's Las Vegas.
Joshua Michael  Josh  Homme (/ËhÉm.i/ HOM-ee; born May 17, 1973) is an American musician, singer, songwriter, record producer, and actor. He is the founder and only continuous member of the rock band Queens of the Stone Age, in which he sings and plays guitar, as well as occasionally playing piano, drums, and bass.omme was formerly a guitarist and founder of the influential stoner rock band Kyuss. He co-founded and occasionally performs with Eagles of Death Metal, playing drums for their studio recordings, and produces a musical improv series with other musicians, mostly from the Palm Desert Scene, known as The Desert Sessions.